Senior Backend Engineer (Remote in Portugal)

TalentCo are delighted to be working with a fast-growing Agentic AI startup looking to hire several high-calibre Senior Backend Engineers into their growing engineering team in the Portugal, having recently closed a significant seed funding round. This hire can be based fully-remote anywhere in Portugal, for this Silicon Valley headquartered startup. You will be at the forefront of building and scaling AI-powered applications, transforming how enterprises interact with intelligent agents. You’ll focus on developing scalable back-end systems that power real-time AI-driven workflows. This role requires strong software engineering skills, a deep understanding of backend development, and the ability to work in a fast-paced, AI-first environment. You’ll collaborate with AI engineers, AI researchers, full-stack engineers and product teams to build enterprise-grade solutions that enable seamless AI-human interactions. As Senior Backend Engineer you will: - Design and build applications that power AI-driven workflows for enterprise users. - Build scalable backend services that support real-time AI interactions, knowledge retrieval, and automation. - Work closely with AI researchers and ML engineers to integrate LLMs, Retrieval-Augmented Generation (RAG), and automation into production-ready applications. - Ship robust, minimal-dependency code that performs efficiently in enterprise environments. - Continuously iterate and refine AI-driven products, balancing user needs with technical feasibility. We want to hear from you if you have: - 6+ years of hands-on experience building production applications, having worked in high-bar engineering environments, particularly startups or scale-ups. - A backend focus, with proficiency in modern web technologies, namely Node.js and Typescript - Strong knowledge of cloud infrastructure (AWS, GCP, or Azure) and scalable architectures. - Understanding of AI-powered applications, including LLMs, chat interfaces, and agentic workflows. - Ability to work in a fast-paced, high-autonomy environment, solving complex problems and delivering impact. - Strong collaboration skills, with experience working in cross-functional teams with engineers, designers, and AI researchers. What do they offer? - Salary between €100k-150k dependent on experience - Meaningful early-stage equity - Fully remote employment contract - Work from anywhere policy